Clean the complex synthetic test notebook

Added better formated text, simplified some figures, better color scales, simplified some of the code. I removed the profile plots in favor of this one generated from the 3d model itself using Mayavi:

![index](https://cloud.githubusercontent.com/assets/290082/5442760/38577e9a-8483-11e4-8b99-24b6f5e0a9d1.png)

This makes the code cleaner and easier to follow (without all the repeated model definitions for 3D and 2D).

On nbviewer: http://nbviewer.ipython.org/github/birocoles/Total-magnetization-of-spherical-bodies/blob/nbclean-complex/notebooks/suppl_tests/complex/complex_test.ipynb